Small typo

scripts/python3/pretel/generate_atm.py

@@ -30,7 +30,7 @@ def generate_atm_parser(subparser):
     parser.add_argument(
         "geo_file",
         default="",
-        help="Geometry file on wich to map the weather type file",
+        help="Geometry file on which to map the weather type file",
     )
     parser.add_argument(
         "weather_file",